diff --git a/gramps/cli/grampscli.py b/gramps/cli/grampscli.py
index 86a363322..d69b9859a 100644
--- a/gramps/cli/grampscli.py
+++ b/gramps/cli/grampscli.py
@@ -280,8 +280,7 @@ class CLIManager(object):
         Register the plugins at initialization time.
         """
         self._pmgr.reg_plugins(PLUGINS_DIR, dbstate, uistate)
-        self._pmgr.reg_plugins(USER_PLUGINS, dbstate, uistate,
-                               append=False, load_on_reg=True)
+        self._pmgr.reg_plugins(USER_PLUGINS, dbstate, uistate, load_on_reg=True)
 
 def startcli(errors, argparser):
     """
diff --git a/gramps/gen/plug/_manager.py b/gramps/gen/plug/_manager.py
index 531c4faa4..cdb895da6 100644
--- a/gramps/gen/plug/_manager.py
+++ b/gramps/gen/plug/_manager.py
@@ -96,7 +96,7 @@ class BasePluginManager(object):
         self.__loaded_plugins = {}
 
     def reg_plugins(self, direct, dbstate=None, uistate=None, 
-                    append=True, load_on_reg=False):
+                    load_on_reg=False):
         """
         Searches the specified directory, and registers python plugin that
         are being defined in gpr.py files. 
@@ -117,9 +117,6 @@ class BasePluginManager(object):
                 # Skip hidden and system directories:
                 if dirname.startswith(".") or dirname in ["po", "locale"]:
                     dirnames.remove(dirname)
-            # add the directory to the python search path
-            if append:
-                sys.path.append(dirpath)
             # if the path has not already been loaded, save it in the 
             # registereddir_list list for use on reloading.
             self.__registereddir_set.add(dirpath)
diff --git a/gramps/plugins/docgen/gtkprint.py b/gramps/plugins/docgen/gtkprint.py
index d80d458ef..828b00996 100644
--- a/gramps/plugins/docgen/gtkprint.py
+++ b/gramps/plugins/docgen/gtkprint.py
@@ -43,7 +43,7 @@ from math import radians
 #
 #------------------------------------------------------------------------
 from gen.plug.docgen import PAPER_PORTRAIT
-import libcairodoc
+import gramps.plugins.lib.libcairodoc as libcairodoc
 from gen.errors import UnavailableError
 #import constfunc
 
diff --git a/gramps/plugins/docgen/htmldoc.py b/gramps/plugins/docgen/htmldoc.py
index ccf2bd179..9763c6c00 100644
--- a/gramps/plugins/docgen/htmldoc.py
+++ b/gramps/plugins/docgen/htmldoc.py
@@ -49,8 +49,8 @@ from gen.ggettext import gettext as _
 from gen.utils.image import resize_to_jpeg
 from gen.const import DATA_DIR, WEBSTUFF_IMAGE_DIR, PROGRAM_NAME, URL_HOMEPAGE, VERSION
 from gen.plug.docgen import BaseDoc, TextDoc, FONT_SANS_SERIF, URL_PATTERN
-from libhtmlbackend import HtmlBackend, process_spaces
-from libhtml import Html
+from gramps.plugins.lib.libhtmlbackend import HtmlBackend, process_spaces
+from gramps.plugins.lib.libhtml import Html
 
 #------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/docgen/odfdoc.py b/gramps/plugins/docgen/odfdoc.py
index b4d077e53..8813b8b99 100644
--- a/gramps/plugins/docgen/odfdoc.py
+++ b/gramps/plugins/docgen/odfdoc.py
@@ -86,7 +86,7 @@ from gen.plug.docgen import (BaseDoc, TextDoc, DrawDoc, graphicstyle,
                     INDEX_TYPE_ALP, PARA_ALIGN_RIGHT, URL_PATTERN,
                     LOCAL_HYPERLINK, LOCAL_TARGET)
 from gen.plug.docgen.fontscale import string_width
-from libodfbackend import OdfBackend
+from gramps.plugins.lib.libodfbackend import OdfBackend
 from gen.const import PROGRAM_NAME, VERSION
 from gen.plug.report import utils as ReportUtils
 from gen.utils.image import image_size, image_dpi, image_actual_size
diff --git a/gramps/plugins/docgen/pdfdoc.py b/gramps/plugins/docgen/pdfdoc.py
index 619ddca2c..50eb35580 100644
--- a/gramps/plugins/docgen/pdfdoc.py
+++ b/gramps/plugins/docgen/pdfdoc.py
@@ -37,7 +37,7 @@ import sys
 # Gramps modules
 #
 #------------------------------------------------------------------------
-import libcairodoc
+import gramps.plugins.lib.libcairodoc as libcairodoc
 from gen.plug.docgen import INDEX_TYPE_ALP, INDEX_TYPE_TOC
 from gen.errors import ReportError
 
diff --git a/gramps/plugins/drawreport/ancestortree.py b/gramps/plugins/drawreport/ancestortree.py
index e5db0c4da..fb67473ab 100644
--- a/gramps/plugins/drawreport/ancestortree.py
+++ b/gramps/plugins/drawreport/ancestortree.py
@@ -73,7 +73,7 @@ _BORN = _('short for born|b.')
 _DIED = _('short for died|d.')
 _MARR = _('short for married|m.')
 
-from libtreebase import *
+from gramps.plugins.lib.libtreebase import *
 
 #------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/drawreport/calendarreport.py b/gramps/plugins/drawreport/calendarreport.py
index 78510b8ed..399b4361f 100644
--- a/gramps/plugins/drawreport/calendarreport.py
+++ b/gramps/plugins/drawreport/calendarreport.py
@@ -54,8 +54,8 @@ from gen.utils.alive import probably_alive
 from gen.datehandler import displayer as _dd, long_days
 import gen.lib
 
-import libholiday
-from libholiday import g2iso
+import gramps.plugins.lib.libholiday as libholiday
+from gramps.plugins.lib.libholiday import g2iso
 
 #------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/drawreport/descendtree.py b/gramps/plugins/drawreport/descendtree.py
index 548d5622f..8fb49df63 100644
--- a/gramps/plugins/drawreport/descendtree.py
+++ b/gramps/plugins/drawreport/descendtree.py
@@ -62,7 +62,7 @@ _MARR = _('short for married|m.')
 
 _RPT_NAME = 'descend_chart'
 
-from libtreebase import *
+from gramps.plugins.lib.libtreebase import *
 
 #------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/export/exportgedcom.py b/gramps/plugins/export/exportgedcom.py
index 76e8c08d4..584c1ff64 100644
--- a/gramps/plugins/export/exportgedcom.py
+++ b/gramps/plugins/export/exportgedcom.py
@@ -44,7 +44,7 @@ import time
 #-------------------------------------------------------------------------
 import gen.lib
 from gen.const import VERSION
-import libgedcom
+import gramps.plugins.lib.libgedcom as libgedcom
 from gen.errors import DatabaseError
 from gui.plug.export import WriterOptionBox
 from gen.updatecallback import UpdateCallback
diff --git a/gramps/plugins/export/exportxml.py b/gramps/plugins/export/exportxml.py
index 73166b058..fc7d7f916 100644
--- a/gramps/plugins/export/exportxml.py
+++ b/gramps/plugins/export/exportxml.py
@@ -63,7 +63,7 @@ from gen.db.exceptions import DbWriteFailure
 from gen.const import VERSION
 from gen.constfunc import win
 from gui.plug.export import WriterOptionBox
-import libgrampsxml
+import gramps.plugins.lib.libgrampsxml as libgrampsxml
 
 #-------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/export/test/exportVCard_test.py b/gramps/plugins/export/test/exportVCard_test.py
index 4eb84fef9..64d7f6ef8 100644
--- a/gramps/plugins/export/test/exportVCard_test.py
+++ b/gramps/plugins/export/test/exportVCard_test.py
@@ -36,8 +36,8 @@ sys.path.append(os.path.join(os.curdir, 'plugins', 'lib'))
 import subprocess
 import libxml2
 
-from libgrampsxml import GRAMPS_XML_VERSION
-from gen.const import VERSION
+from gramps.plugins.lib.libgrampsxml import GRAMPS_XML_VERSION
+from gramps.gen.const import VERSION
 import exportvcard
 
 class VCardCheck(unittest.TestCase):
diff --git a/gramps/plugins/gramplet/editexifmetadata.py b/gramps/plugins/gramplet/editexifmetadata.py
index 4f02c067e..c258eb880 100644
--- a/gramps/plugins/gramplet/editexifmetadata.py
+++ b/gramps/plugins/gramplet/editexifmetadata.py
@@ -56,7 +56,7 @@ from gen.datehandler import parser as _dp
 
 from gen.plug import Gramplet
 
-from libmetadata import MetadataView, format_datetime
+from gramps.plugins.lib.libmetadata import MetadataView, format_datetime
 from gui.widgets import ValidatableMaskedEntry
 from gen.errors import ValidationError
 from gui.dialog import QuestionDialog, OptionDialog
diff --git a/gramps/plugins/gramplet/metadataviewer.py b/gramps/plugins/gramplet/metadataviewer.py
index 3e0a9f4a9..5c6d2f2ec 100644
--- a/gramps/plugins/gramplet/metadataviewer.py
+++ b/gramps/plugins/gramplet/metadataviewer.py
@@ -22,7 +22,7 @@
 # $Id$
 #
 
-from libmetadata import MetadataView
+from gramps.plugins.lib.libmetadata import MetadataView
 from gen.plug import Gramplet
 from gen.utils.file import media_path_full
 
diff --git a/gramps/plugins/import/importgedcom.py b/gramps/plugins/import/importgedcom.py
index 771971bc5..acd17dcb1 100644
--- a/gramps/plugins/import/importgedcom.py
+++ b/gramps/plugins/import/importgedcom.py
@@ -45,8 +45,8 @@ LOG = logging.getLogger(".GedcomImport")
 #------------------------------------------------------------------------
 from gen.errors import DbError, GedcomError
 from gui.glade import Glade
-from libmixin import DbMixin
-import libgedcom
+from gramps.plugins.lib.libmixin import DbMixin
+import gramps.plugins.lib.libgedcom as libgedcom
 module = __import__("libgedcom")
 reload (module)
 
diff --git a/gramps/plugins/import/importxml.py b/gramps/plugins/import/importxml.py
index 14d9363f7..7cd3e2971 100644
--- a/gramps/plugins/import/importxml.py
+++ b/gramps/plugins/import/importxml.py
@@ -58,7 +58,7 @@ from gen.db.dbconst import (PERSON_KEY, FAMILY_KEY, SOURCE_KEY, EVENT_KEY,
                             TAG_KEY, CITATION_KEY)
 from gen.updatecallback import UpdateCallback
 from gen.const import VERSION
-import libgrampsxml
+import gramps.plugins.lib.libgrampsxml
 
 #-------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/import/test/importVCard_test.py b/gramps/plugins/import/test/importVCard_test.py
index 9bbe67134..5dc9b05ae 100644
--- a/gramps/plugins/import/test/importVCard_test.py
+++ b/gramps/plugins/import/test/importVCard_test.py
@@ -39,7 +39,7 @@ import subprocess
 import libxml2
 import libxslt
 
-from libgrampsxml import GRAMPS_XML_VERSION
+from gramps.plugins.lib.libgrampsxml import GRAMPS_XML_VERSION
 
 from gen.const import ROOT_DIR, VERSION
 import importvcard
diff --git a/gramps/plugins/lib/libhtmlbackend.py b/gramps/plugins/lib/libhtmlbackend.py
index 090ec0121..3b3163dde 100644
--- a/gramps/plugins/lib/libhtmlbackend.py
+++ b/gramps/plugins/lib/libhtmlbackend.py
@@ -43,7 +43,7 @@ import os.path
 #
 #------------------------------------------------------------------------
 from gen.plug.docbackend import DocBackend
-from libhtml import Html, xml_lang
+from gramps.plugins.lib.libhtml import Html, xml_lang
 from gen.errors import ReportError
 
 
diff --git a/gramps/plugins/lib/libnarrate.py b/gramps/plugins/lib/libnarrate.py
index 6f0e2db08..e76f34acd 100644
--- a/gramps/plugins/lib/libnarrate.py
+++ b/gramps/plugins/lib/libnarrate.py
@@ -42,7 +42,7 @@ from gen.lib.familyreltype import FamilyRelType
 from gen.display.name import displayer as _nd
 from gen.utils.alive import probably_alive
 from gen.plug.report import utils as ReportUtils
-from libtranslate import Translator
+from gramps.plugins.lib.libtranslate import Translator
 
 #-------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/lib/libtreebase.py b/gramps/plugins/lib/libtreebase.py
index d85411d00..59e7bd50d 100644
--- a/gramps/plugins/lib/libtreebase.py
+++ b/gramps/plugins/lib/libtreebase.py
@@ -33,7 +33,7 @@ from gen.plug.report import utils as ReportUtils
 
 from gen.display.name import displayer as name_displayer
 
-from libsubstkeyword import SubstKeywords
+from gramps.plugins.lib.libsubstkeyword import SubstKeywords
 
 PT2CM = ReportUtils.pt2cm
 
diff --git a/gramps/plugins/mapservices/eniroswedenmap.py b/gramps/plugins/mapservices/eniroswedenmap.py
index d43c6ee60..0238c3ca6 100644
--- a/gramps/plugins/mapservices/eniroswedenmap.py
+++ b/gramps/plugins/mapservices/eniroswedenmap.py
@@ -38,7 +38,7 @@ from gen.ggettext import gettext as _
 # GRAMPS modules
 #
 #------------------------------------------------------------------------
-from libmapservice import MapService
+from gramps.plugins.lib.libmapservice import MapService
 from gui.dialog import WarningDialog
 
 # Make upper case of translaed country so string search works later
diff --git a/gramps/plugins/mapservices/googlemap.py b/gramps/plugins/mapservices/googlemap.py
index 289cb615c..3f31a7e16 100644
--- a/gramps/plugins/mapservices/googlemap.py
+++ b/gramps/plugins/mapservices/googlemap.py
@@ -35,7 +35,7 @@ from gen.ggettext import gettext as _
 # GRAMPS modules
 #
 #------------------------------------------------------------------------
-from libmapservice import MapService
+from gramps.plugins.lib.libmapservice import MapService
 
 class GoogleMapService(MapService):
     """Map  service using http://maps.google.com"""
diff --git a/gramps/plugins/mapservices/openstreetmap.py b/gramps/plugins/mapservices/openstreetmap.py
index a8414faa3..d30f46c61 100644
--- a/gramps/plugins/mapservices/openstreetmap.py
+++ b/gramps/plugins/mapservices/openstreetmap.py
@@ -35,7 +35,7 @@ from gen.ggettext import gettext as _
 # GRAMPS modules
 #
 #------------------------------------------------------------------------
-from libmapservice import MapService
+from gramps.plugins.lib.libmapservice import MapService
 
 
 class OpensStreetMapService(MapService):
diff --git a/gramps/plugins/textreport/ancestorreport.py b/gramps/plugins/textreport/ancestorreport.py
index b82201499..45c8031c0 100644
--- a/gramps/plugins/textreport/ancestorreport.py
+++ b/gramps/plugins/textreport/ancestorreport.py
@@ -51,8 +51,8 @@ from gen.plug.report import Report
 from gen.plug.report import utils as ReportUtils
 from gen.plug.report import MenuReportOptions
 from gen.utils.trans import get_available_translations
-from libnarrate import Narrator
-from libtranslate import Translator, get_language_string
+from gramps.plugins.lib.libnarrate import Narrator
+from gramps.plugins.lib.libtranslate import Translator, get_language_string
 
 #------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/textreport/birthdayreport.py b/gramps/plugins/textreport/birthdayreport.py
index 29b1bc916..11ecac083 100644
--- a/gramps/plugins/textreport/birthdayreport.py
+++ b/gramps/plugins/textreport/birthdayreport.py
@@ -53,7 +53,7 @@ from gen.plug.report import MenuReportOptions
 from gen.utils.alive import probably_alive
 from gen.datehandler import displayer as _dd, long_days
 
-import libholiday
+import gramps.plugins.lib.libholiday as libholiday
 
 #------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/textreport/detancestralreport.py b/gramps/plugins/textreport/detancestralreport.py
index 062fd9e74..3232df7cf 100644
--- a/gramps/plugins/textreport/detancestralreport.py
+++ b/gramps/plugins/textreport/detancestralreport.py
@@ -56,9 +56,9 @@ from gen.plug.report import MenuReportOptions
                         
 import gen.datehandler
 
-from libnarrate import Narrator
+from gramps.plugins.lib.libnarrate import Narrator
 from gen.utils.trans import get_available_translations
-from libtranslate import Translator, get_language_string
+from gramps.plugins.lib.libtranslate import Translator, get_language_string
 
 #------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/textreport/detdescendantreport.py b/gramps/plugins/textreport/detdescendantreport.py
index 6e0cfd7ae..430cce74d 100644
--- a/gramps/plugins/textreport/detdescendantreport.py
+++ b/gramps/plugins/textreport/detdescendantreport.py
@@ -60,9 +60,9 @@ from gen.plug.report import MenuReportOptions
                         
 import gen.datehandler
 
-from libnarrate import Narrator
+from gramps.plugins.lib.libnarrate import Narrator
 from gen.utils.trans import get_available_translations
-from libtranslate import Translator, get_language_string
+from gramps.plugins.lib.libtranslate import Translator, get_language_string
 
 #------------------------------------------------------------------------
 #
diff --git a/gramps/plugins/tool/phpgedviewconnector.py b/gramps/plugins/tool/phpgedviewconnector.py
index 688fe54ca..d1d9e1305 100644
--- a/gramps/plugins/tool/phpgedviewconnector.py
+++ b/gramps/plugins/tool/phpgedviewconnector.py
@@ -30,7 +30,7 @@ import os
 from tempfile import mkstemp
 from gen.ggettext import gettext as _
 from gui.glade import Glade
-import libgedcom
+import gramps.plugins.lib.libgedcom as libgedcom
 
 #
 # Interface to phpGedView
diff --git a/gramps/plugins/tool/relcalc.py b/gramps/plugins/tool/relcalc.py
index f9b32b7be..98ec11531 100644
--- a/gramps/plugins/tool/relcalc.py
+++ b/gramps/plugins/tool/relcalc.py
@@ -48,7 +48,7 @@ from gi.repository import Gtk
 from gen.display.name import displayer as name_displayer
 from gui.managedwindow import ManagedWindow
 from gui.views.treemodels import PeopleBaseModel, PersonTreeModel
-from libpersonview import BasePersonView
+from gramps.plugins.lib.libpersonview import BasePersonView
 from gen.relationship import get_relationship_calculator
 
 from gui.dialog import ErrorDialog
diff --git a/gramps/plugins/view/personlistview.py b/gramps/plugins/view/personlistview.py
index 57f944d8b..42210337a 100644
--- a/gramps/plugins/view/personlistview.py
+++ b/gramps/plugins/view/personlistview.py
@@ -32,7 +32,7 @@ Person list View
 #
 #-------------------------------------------------------------------------
 from gui.views.listview import LISTTREE
-from libpersonview import BasePersonView
+from gramps.plugins.lib.libpersonview import BasePersonView
 from gui.views.treemodels.peoplemodel import PersonListModel
 import gen.lib
 
diff --git a/gramps/plugins/view/persontreeview.py b/gramps/plugins/view/persontreeview.py
index 0ec0cead6..8af6152b0 100644
--- a/gramps/plugins/view/persontreeview.py
+++ b/gramps/plugins/view/persontreeview.py
@@ -39,7 +39,7 @@ from gi.repository import Gtk
 #
 #-------------------------------------------------------------------------
 from gui.views.listview import LISTTREE
-from libpersonview import BasePersonView
+from gramps.plugins.lib.libpersonview import BasePersonView
 from gui.views.treemodels.peoplemodel import PersonTreeModel
 import gen.lib
 from gen.errors import WindowActiveError
diff --git a/gramps/plugins/view/placelistview.py b/gramps/plugins/view/placelistview.py
index ac1bb435f..84d373017 100644
--- a/gramps/plugins/view/placelistview.py
+++ b/gramps/plugins/view/placelistview.py
@@ -28,7 +28,7 @@ Place List View
 # Gramps modules
 #
 #-------------------------------------------------------------------------
-from libplaceview import PlaceBaseView
+from gramps.plugins.lib.libplaceview import PlaceBaseView
 from gui.views.treemodels.placemodel import PlaceListModel
 
 #-------------------------------------------------------------------------
diff --git a/gramps/plugins/view/placetreeview.py b/gramps/plugins/view/placetreeview.py
index bf1357694..1a40bcd91 100644
--- a/gramps/plugins/view/placetreeview.py
+++ b/gramps/plugins/view/placetreeview.py
@@ -29,7 +29,7 @@ Place Tree View
 #
 #-------------------------------------------------------------------------
 from gui.views.listview import LISTTREE
-from libplaceview import PlaceBaseView
+from gramps.plugins.lib.libplaceview import PlaceBaseView
 from gui.views.treemodels.placemodel import PlaceTreeModel, COUNTRYLEVELS
 import gen.lib
 from gen.errors import WindowActiveError
diff --git a/gramps/plugins/webreport/narrativeweb.py b/gramps/plugins/webreport/narrativeweb.py
index 4573f3260..07b4153e2 100644
--- a/gramps/plugins/webreport/narrativeweb.py
+++ b/gramps/plugins/webreport/narrativeweb.py
@@ -99,16 +99,16 @@ import gen.mime
 from gen.display.name import displayer as _nd
 from gen.datehandler import displayer as _dd
 from gen.proxy import PrivateProxyDb, LivingProxyDb
-from libhtmlconst import _CHARACTER_SETS, _CC, _COPY_OPTIONS
+from gramps.plugins.lib.libhtmlconst import _CHARACTER_SETS, _CC, _COPY_OPTIONS
 
 # import HTML Class from src/plugins/lib/libhtml.py
-from libhtml import Html, xml_lang
+from gramps.plugins.lib.libhtml import Html, xml_lang
 
 # import styled notes from src/plugins/lib/libhtmlbackend.py
-from libhtmlbackend import HtmlBackend, process_spaces
+from gramps.plugins.lib.libhtmlbackend import HtmlBackend, process_spaces
 
-from libgedcom import make_gedcom_date
-from gen.utils.alive import probably_alive
+from gramps.plugins.lib.libgedcom import make_gedcom_date
+from gramps.gen.utils.alive import probably_alive
 from gen.utils.place import conv_lat_lon
 from gui.pluginmanager import GuiPluginManager
 
diff --git a/gramps/plugins/webreport/webcal.py b/gramps/plugins/webreport/webcal.py
index 8af8210c2..cabd2cc3e 100644
--- a/gramps/plugins/webreport/webcal.py
+++ b/gramps/plugins/webreport/webcal.py
@@ -64,14 +64,14 @@ from gen.datehandler import displayer as _dd, long_days
 
 from gen.display.name import displayer as _nd
 
-import libholiday
-from libhtml import Html, xml_lang
-from libhtmlconst import _CHARACTER_SETS, _CC, _COPY_OPTIONS
+import gramps.plugins.lib.libholiday as libholiday
+from gramps.plugins.lib.libhtml import Html, xml_lang
+from gramps.plugins.lib.libhtmlconst import _CHARACTER_SETS, _CC, _COPY_OPTIONS
 from gui.pluginmanager import GuiPluginManager
 
 # import styled notes from
 # src/plugins/lib/libhtmlbackend.py
-from libhtmlbackend import HtmlBackend
+from gramps.plugins.lib.libhtmlbackend import HtmlBackend
 #------------------------------------------------------------------------
 # constants
 #------------------------------------------------------------------------